| 摘要 |
A thermal insulating bag, with a waterproof outside surface and a heat-reflecting inside surface, is installed, open end downward, over a backflow prevention valve and the associated above-ground water pipes, to cover them. The bag has ballast contained in a hem around the perimeter of the open end, enabling the open end of the bag to conform to and seal against an irregular ground surface. The bag is flexible and can be rolled up or folded flat or in any desired configuration for storage. The ballast material, being heavy, holds the bag down on the ground and, being fluid-like, enables the perimeter of the open end to engage the contour of the ground throughout the perimeter to provide an effective cover-to-ground seal. Tabs extend outward at the open end and have holes in them to enable installation of anchor stakes, to anchor the lower end of the bag to the ground, desired. One embodiment electrically heated.
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